What happens when calcium is treated with water?

(i) The gas released during the reaction catches fire.
(ii) Calcium reacts with water less violently as compared to sodium.
(iii) Bubbles of hydrogen gas formed stick to the surface of calcium.

Only (ii)

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(i) and (ii)

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Only (i)

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(ii) and (iii)

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Solution

The correct option is D (ii) and (iii)
Option (d) is correct.

Unlike sodium, calcium does not undergo violent reaction with water. Though the reaction is exothermic, the heat evolved is not sufficient to cause an explosive reaction.

$Ca(s) + 2 H_{2} O(l) \to {Ca(OH)}_{2} (aq) + H_{2} (g)$

Calcium starts floating because the bubbles of hydrogen gas formed during the reaction stick to its surface and lifts it up.

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What happens when calcium is treated with water?

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I. It does not react with water.
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Question 6
What happens when calcium is treated with water?

(i) It does not react with water.
(ii) It reacts violently with water.
(iii) It reacts less violently with water.
(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.

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What happens when calcium is treated with cold water?

(i) It does not react with cold water.
(ii) Hydrogen gas evolved catches fire.
(iii) Hydrogen gas evolved does not catch fire.
(iv) Calcium floats on the surface of the water.

Q. Assertion :Calcium floats over water during the reaction with water. Reason: Calcium reacts with water less vigorously so that the heat evolved is not sufficient for the hydrogen formed, to catch fire. The bubbles of hydrogen gas formed stick to the surface of the water calcium

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What happens when calcium is treated with water? (i) The gas released during the reaction catches fire. (ii) Calcium reacts with water less violently as compared to sodium. (iii) Bubbles of hydrogen gas formed stick to the surface of calcium.

What happens when calcium is treated with water?

(i) The gas released during the reaction catches fire.
(ii) Calcium reacts with water less violently as compared to sodium.
(iii) Bubbles of hydrogen gas formed stick to the surface of calcium.